I've been following all n900s listed on Ebay UK and initial listing prices have slumped down to as low as 250, typically 300-ish. Bidding is quite fierce on items starting under 300, those starting over 425 usually attract no bids unless new in box from reputable dealers.
Closing prices generally are up to 400, typically 380, unless NIB; occasionally one will sell for 350.

Some recent cashback deals with discount codes highlighted on hotukdeals.com might have gone unnoticed but that pushed the new price down below 400.

Next bulletin as trends emerge.